Well if the size is the same then it won't look any better but it will be smoother as long as your system is pushing FPS above the 60hz mark on that 144hz.
It really depends on the types of games you play, for FPS and racing games the 144hz will be an improvement but if your playing less competitive games I'd look at a IPS/75hz monitor, or if your games support 21:9 I'd look at a 2560x1080P/75hz/IPS.